This paper presents a multi-case study on universal crisis information design, focusing on individuals with communication disorders, the elderly, and immigrants. Using a research-through-design approach and various qualitative data collection methods, the study explores accessible information solutions by examining the accessibility of crisis information design and developing universal crisis information design guidelines based on the findings. The findings highlight the necessity for simplified crisis messages, multimodal communication, and the involvement of community facilitators. This leads to a set of guidelines for universal crisis information design, including integrating adaptive technologies and multiple communication channels to enhance trust and inclusivity in crisis management. The study underscores the importance of community-based strategies and the role of personalized, clear, and trustworthy information in improving crisis preparedness and response among vulnerable groups.